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Full text of "Handbook Of Chemical Engineering - I"

318
CHEMICAL ENGINEERING
current exerts a suction on the bags. During the period of draft reversal the bags are vigorously shaken by a small compressor located at the top of the cylinder. It is possible to adjust the shaking apparatus so that the 4-sec. shaking period will come in 2 min. and from this up to 2 hr.
It is the great number of shakings and their thoroughness which gives this type of filter its capacity. On average gases it has a capacity of 10 cu. ft. of dust-laden air per minute to the square foot of cloth area. Closely woven cloth can be used because the vigorous shaking keeps the interstices open.
As an example of the use of the filter a zinc oxide separation can be described. The fumes arose from gas-fired reverberatories and were cooled by passage through 1,200 ft. of 20-in. copper pipe. About as much dust was collected in the cooler as in the filter. The filter plant consisted of eight unit cylinders each compartment con-
STOCKING DUST COLLECTOR DIMENSIONS
Number	Size of inlet	Size over all			Feet of cloth
		Length	Width	Height	
13	4% in. by 31     in.	4ft.   6     in.	4 ft. 11 in.	6 ft. 6 in.	243
14	4% in. by 38^ in.	5ft.   IK in.	4 ft. 11 in.	6 ft. 6 in.	301
15	4% in. by 46     in.	5 ft.   9     in.	4 ft. 11 in.	6 ft. 6 in.	343
16	4M in. by 53 ^ in.	6ft.   4J^ in.	4 ft. 11 in.	6 ft. 6 in.	415
17	4% in. by 61     in.	7 ft.   0     in.	4 ft. 11 in.	6 ft. 6 in.	481
21	5% in. by 31     in.	4 ft.   6     in.	5 ft.   9 in.	7 ft. 6 in.	323
22	5% in. by 38K in.	5ft.   IK in.	5ft.   9 in.	7 ft. 6 in.	402
23	5?4 in. by 46     in.	5 ft.   9     in.	5 ft.   9 in.	7 ft. 6 in.	476
24	5% in. by 53}^ in.	6ft.   4Kin.	5 ft.   9 in.	7jf t. 6 in.	549
25	5% in. by 61     in.	7 ft.   0     in.	5 ft.   9 in.	7 ft. 6 in.	629
26	5M in. by 68^ in.	7ft.   7% in.	5ft.   9 in.	7 ft. 6 in.	723
27	5Ji in. by 76     in.	8ft.   3     in.	5 ft.   9 in.	7 ft. 6 in.	813
31	6Ji in. by 53K in.	6ft.   4Kin.	6ft.   9 in.	8 ft. 9 in.	739
32	6% in. by 61     in.	7 ft.   0     in.	6ft.   9 in.	8 ft. 9 in.	829
33	6% in. by 68% in.	7ft.   7% in.	6 ft.   9 in.	8 ft. 9 in.	965
34	6% in. by 76     in.	8 ft.   3     in.	6 ft.   9 in.	8 ft. 9 in.	1,073
35	6% in. by 83M in.	8 ft. 10K in.	6ft.   9 in.	8 ft. 9 in.	1,180
36	6% in. by 91     in.	9 ft.   6     in.	6 ft.   9 in.	8 ft. 9 in.	1,288
45	7% in. by 83M in.	8 ft. 10K in.	7ft.   3 in.	9 ft. 3 in.	1,398
46	7M in. by 91     in.	9 ft.   6     in.	7ft.   Sin.	9 ft. 3 in.	1,514
taining 12 bags 9 ft. long by 7 in. diameter or 190 sq. ft. of filtering area. The exhaust fan used was a No. 9 Buffalo Forge running at about 1,100 r.p.m. and produced a vacuum of about 5 in. of water. To force the gases through the filter required a head of about 3 in. of water. The volume of gas arriving at the filter was 9,000 cu. ft. per minute consequently the capacity of the filter per square foot of cloth surface was 6 cu. ft. The gases contained a little SC>2 and a little SOs. Woolen bags are used and last a year. Shaking is at 2-min. intervals and requires 16 cu. ft. of free air